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Simplifying 9r + -12 + -16 = 0 Reorder the terms: -12 + -16 + 9r = 0 Combine like terms: -12 + -16 = -28 -28 + 9r = 0 Solving -28 + 9r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 9r = 0 + 28 Combine like terms: -28 + 28 = 0 0 + 9r = 0 + 28 9r = 0 + 28 Combine like terms: 0 + 28 = 28 9r = 28 Divide each side by '9'. r = 3.111111111 Simplifying r = 3.111111111
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